FR2800562A1 - ELECTROMAGNETIC INDUCTION TYPE COOKING APPARATUS - Google Patents

Abstract

The invention relates to a cooking appliance of the electromagnetic induction type. This appliance (5) comprises a body (7) in an interior space of which the food to be cooked is placed, several receiving grooves (8) separated from each other. in an independent manner in the lower surface of the body and several induction heating elements (9) of electromagnetic type, separated from each other and fixed so as to correspond to each of the plurality of grooves. Application in particular to cooking utensils. cooked.

Description

ELECTROMAGNETIC INDUCTION TYPE COOKING APPARATUS

  The present invention relates to an apparatus for

  electromagnetic induction type cooking and more

  especially an induction type cooking appliance

  electromagnetic, which may include a plurality of elements

  induction heaters independently of each other and attached to the bottom surface of a body of the cooking appliance without the use of a single type induction heater

  plate, in which case, when a possible detachment of the elements

  induction heating elements occurs due to dif-

  causes such as, for example, the penetration of humi-

  dity, a shock in use, etc., only the part of the induction heating elements subjected to the shock can be detached from the body of the cooking appliance, without all the induction heating elements being

detach.

  Generally, an electromagnetic induction device radiates heat so that an intense high frequency electromagnetic field is

  established by the use of a coil and an undu-

  their, and induced currents then flow in a magnetic conductor, whereby the magnetic conductor having an intense induction property is

  arranged in the electromagnetic field.

  An electric induction type cooking appliance

  tromagnetic implementing the principles indicated pre-

  cédemment is equipped with a metallic element of induction heating which has a characteristic of conductor and is fixed to the lower surface of the cooking appliance

  and, when the cooking appliance is placed on the device

  electromagnetic induction, Fou-

  cault circulate in the induction heating element in

  due to the presence of the electromagnetic field of the dispo-

  electromagnetic induction device. Fou's currents

  cault lead to a loss which in turn causes the internal particles to collide so as to heat

  the cooking appliance. As a result, the food available

  placed inside the cooking appliance is thus

heated and cooked.

  Figures 1 and 2, annexed to this application, are, respectively, a sectional view illustrating a cooking appliance of the electromagnetic induction type and a partial view on a larger scale of this appliance. As shown, the electromagnetic induction type cooking appliance 1 is configured such that only one type of plate of the metal induction heating element 4 is fixed firmly to the recessed portion

  3 of the lower exterior surface of the body 7 of the apparatus

  baking tray, in which the food is placed

cook.

  In this case, the induction heating element 4 has the shape of an essentially thin plate and can be fixed firmly to the recess 3 by means of different fixing methods such as

  example a forced compression process using a different

  temperature reference - enter the body 3 --- of --- the device -of- ..

  cooking and the induction heating element 4, a welding process using a capsule, a riveting process, etc. However, in the conventional cooking appliance 1 of the electromagnetic induction type, the penetration of more than boiling water during cooking and the water occurring during cleaning between the induction heating element 4 and the recessed portion 3 of the lower surface of the body 2 of the cooking appliance causes oxidation of the part where the water has penetrated, which leads to the detachment of the induction heating element 4, from the part in

withdrawal 3.

  This is why, since the induction heating element has the shape of a single thin plate in the conventional cooking appliance, oxidation occurs on the whole of the fixed edge part, between the induction heating element 4 and the part in

  shrinkage 3, with continuous cooking so that the whole

  ble of the induction heating element 4 detaches from the body 2 of the cooking appliance, which prevents

  continue to use the cooking appliance.

  This is why an object of the invention is to provide

  an electric induction type cooking appliance

  genetic, which is capable of comprising a plurality

  inductive heating elements separated independently

  hanging and fixed respectively to the lower surface of a body of the cooking appliance without the use of a single-type induction heating element

  plate, in which case, when a possible detachment of the elements

  induction heating elements occurs due to dif-

  causes such as, for example, the ingress of moisture, shock during use, etc., only the

  relative part, which received the shock, of the heating elements

  the induction cooker can be detached from the body of the cooking appliance, without all the heating elements

induction do come off.

  -. To achieve this and other objectives of the present invention, there is provided an apparatus of the electromagnetic induction type, characterized in that it comprises a body comprising a space inside which food to be cooked is placed, a plurality of receiving grooves arranged so as to be independently separated from each other on the lower surface of said body of the cooking appliance, and a plurality of induction heating elements having a magnetic property and arranged in a manner to be separated from each other independently, each element of said plurality of induction heating elements being fixed so as to correspond to each of said

  plurality of receiving grooves.

  According to another characteristic of the invention, said plurality of receiving grooves are arranged in

  such that said grooves are arranged sequentially

  tially by forming concentric circles from a center of the lower base of said body of the cooking appliance towards the outside of this body, said center of the lower base of said body of the cooking appliance constituting the center of each said concentric circles, and said plurality of induction heating elements being correspondingly fixed in said

  plurality of receiving grooves.

  According to another characteristic of the invention, each groove of said plurality of receiving grooves is serrated over a predetermined width and is arranged parallel to the adjacent receiving grooves, and said plurality of induction heating elements are

  correspondingly fixed in said plurality of rails

reception.

  According to another characteristic of the invention, said plurality of receiving grooves are arranged by being arranged sequentially by forming circles

  concentric from a center-base-inf-i-eure-du-

  body of the cooking appliance outwardly and are also divided radially at the lower distances of said body of the cooking appliance and said plurality of induction heating elements are correspondingly fixed in said plurality of

receiving grooves.

  According to another characteristic of the invention, each groove of said plurality of receiving grooves

has a rough surface.

  According to another characteristic of the invention, each groove of said plurality of receiving grooves has the shape of a V turned over in the surface of the base.

  lower of said body of the cooking appliance.

  According to another characteristic of the invention, each of said plurality of induction heating elements comprises a metallic material having a magnetic property and applied by injection, over a predetermined thickness, onto an adhesive material (10) deposited in

  each groove of said plurality of receiving grooves

  and aluminum applied by injection and coating

  vrant, over a predetermined thickness, said metallic material.

  Other features and advantages of the pre-

  sente invention will emerge from the description given below

  after reference to the accompanying drawings, on the-

  which: - Figure 1, which has already been mentioned, is a sectional view showing a conventional cooking appliance of the electromagnetic induction type; - Figure 2, which has already been mentioned, is a view on a larger scale showing the main part of Figure 1; - Figure 3 is a sectional view showing

  an electromagnetic induction type cooking appliance

  tick relating to a first embodiment of the present invention; - Figure 4 is an enlarged view

  representing the main part of FIG. 3, and represented

  feels a plurality of induction heaters attached thereto; - Figure 5 is a bottom view showing

  the induction type cooking appliance of the electro- type

  magnetic in accordance with the first embodiment of the present invention; - Figure 6 is a bottom view showing the cooking apparatus of the electromagnetic induction type according to a second embodiment of the present invention; and - Figure 7 is a bottom view showing the cooking appliance of the electromagnetic induction type according to a third embodiment of the

present invention.

  Below we will explain in detail the construction and the effect produced by an electromagnetic induction type cooking appliance in accordance with the preferred embodiments of the present invention,

  with reference to the accompanying drawings.

  Figure 3 is a sectional view showing a cooking appliance of the electromagnetic induction type

  in accordance with a first embodiment of the pre-

  invention, Figure 4 is an enlarged view showing the main parts of Figure 3

  and showing a plurality of induction heating elements

  tion, which are attached thereto, and Figures 5 to 7 show views from below showing the cooking appliance of the

  electromagnetic induction type according to pre-

  second, third and third embodiments of the

present invention.

  Referring first to Figures 3 to 7, we

  sees that a cooking appliance 5 of the electric induction type

  tromagnetic according to the present invention comprises a body 7 comprising a space 6, inside which is disposed

  a food to be cooked, a plurality of receiving grooves

  tion 8 separated from each other, independently, in the lower surface of the body 7 of the cooking appliance, preferably in the lower exterior surface of the body of the cooking appliance, a plurality of heating elements to induction 9 each having a magnetic property and formed according to an injection process so as to be separated from each other independently, each element of the plurality of induction heating elements 9 being fixed so as to correspond to each groove of the plurality of receiving grooves 8. Consequently, in the cooking appliance 5 of

  electromagnetic induction type according to the present invention

  tion, the plurality of induction heating elements 9 are separated from each other, independently, to be fixed so as to correspond to the plurality of

  receiving grooves 8, but they can operate globally

  balement like a single induction heating plate. Therefore, when the electromagnetic induction type cooking apparatus 5 is disposed on an electromagnetic induction device (which is not shown in the drawings), the plurality of induction heating elements act as a unique element of induction heating to cook the contained food

in the cooking appliance.

  In this case, the plurality of receiving grooves

  tion 8 have any of different shapes and are independently arranged in adjacent positions in the lower surface of the body 7 of the cooking appliance, and will be explained in

reference to Figures 5 to 7.

  Figures 3 to 5 show the receiving grooves 8 and induction heating elements 9 arranged in accordance with the first embodiment of

  the present invention. As shown, most of the

  lity of receiving grooves 8 are arranged in such a way that the receiving grooves are arranged successively by forming concentric circles from the center of the lower base of the body 7 of the cooking appliance towards the outside of the latter. The center of the lower part of the body 7 of the cooking appliance constitutes the center of each of the concentric circles, and each receiving groove has a triangular shape (a corner or an inverted "V") in cross section with the V being directed. inwardly of the body 7 of the cooking appliance from the lower exterior surface of the latter. The induction heating elements 9 are fixed

  in the receiving grooves 8, for example according to a pro-

yielded injection.

  Referring to Figure 6 which shows the

  second embodiment of the present invention, each

  one of the receiving grooves 8 is serrated on a lar-

  predetermined ger and is arranged parallel to the rails

  adjacent reception areas 8. As in the above, the induction heating elements

  9 are formed so as to be fixed in a corresponding manner

  dante in the receiving grooves 8, by means of the injection process. The receiving grooves 8 are independently formed in straight lines, as shown, but can be arranged in curved lines or have any other shape, as long as the receiving grooves 8 are designed to be

independent of each other.

  As in the first embodiment, the second embodiment is arranged such that the plurality of receiving grooves 8 and the plurality of induction heating elements 9 are formed respectively so as to be separated from each other.

others, independently.

  Referring to Figure 7, which shows the third embodiment of the present invention, the plurality of receiving grooves 8 are arranged such that said grooves 8 are arranged successively in concentric circles from the center of the base part lower part of the body of the cooking appliance 7 towards the outside of this body and are also divided radially at the center of the lower part of the body 7 of the cooking appliance so that each receiving groove 8 has an area that is concentrically and radially independent. Using the same method as that described above, the induction heating elements 9, which are arranged to be separated from each other independently, are fixed so

  corresponding to the receiving grooves 8.

  Although there have been described embodiments

  tion of the present invention, each receiving groove 8 may have shapes which differ from those

  indicated in these embodiments.

  In other words, each of the receiving grooves 8 can have a polygonal shape or a shape of an element of an assembly puzzle. Preferably each of the receiving grooves 8 is arranged so as to have the shape of an inverted V (a wedge shape) so as to increase the contact surface during the fixing of the induction heating element 9 by means of an adhesive 10, and moreover the recessed surface of the receiving groove is made rough. Such a roughness creation method can be easily performed using

a sandblasting technique.

  The induction heating element 9, which is fixed to the surface of each of the receiving grooves 8,

  consists of a metallic powder 11 having a pro-

  magnetic properties, and aluminum powder 12 injected and applied to the outer face of the metallic material 11, this material being deposited sequentially on each of the receiving grooves 8 by means of an electric arc discharge. In this case, the metallic material 11 consists of 95% by weight of nickel steel powder and

  by 5% by weight of aluminum powder.

  Referring to Figure 4, which illustrates the pro-

  procedure for applying the induction heating elements 9 to the receiving grooves 8, the adhesive material 10 is injected uniformly using an electric arc discharge on the rough surface of each of the receiving grooves 8, then injects the metal powder 11 comprising 95% by weight of nickel steel powder and 5% by weight of aluminum powder and is deposited over a thickness of approximately 80 mm on the material

  adhesive 10, by means of an electric arc discharge.

  Then, we inject the aluminum powder and dry it to a thickness of about 50 mm on the surface of the

coated metallic material 11.

  In this case, the metallic material 11 is injected

  until the outer surface of the metal and aluminum

  minium filling the receiving groove 8 with the inverted V shape is level with the lower exterior surface of the body of the cooking appliance, taking into account its magnetic stability and the shape of the receiving groove. As described above, in accordance with the electromagnetic induction type cooking appliance according to the present invention, despite the penetration

  more than boiling water during cooking and pro-

  coming from washing, inside the receiving grooves 8 or due to various causes tending to detach the

  induction heating elements 9 receiving grooves

  tion 8, only the part, having been impacted, of the induction heating elements 9 can detach from the body 7 of the cooking appliance so that no detachment occurs from all of the heating elements at

  induction 9 from the body 7 of the cooking appliance.

  Therefore, since the induction heaters 9 are partially detachable, the other induction heaters 9 can induce heat in the body of the cooker, sufficient to cook the food. contained therein. This provides the advantage that the service life of the induction type cooking appliance

  electromagnetic can be extended.

  In addition, since the induction heating elements are applied and deposited sequentially on the surfaces of the receiving grooves, they can be very tight, which provides the advantage

  additional, that the undesirable detachment

  map of induction heating elements due to penetration

  tration of water in these elements can be greatly reduced.

Claims (7)

  1. A cooking appliance (5) of the electromagnetic induction type, characterized in that it comprises: a body (7) comprising a space inside which a food to be cooked is arranged;   a plurality of receiving grooves (8) arranged   created so as to be independently separated from each other on the lower surface of said body (7) of the cooking appliance, and a plurality of induction heating elements (9) having a magnetic property and arranged so to be separated from each other independently, each element of said plurality of induction heating elements being fixed so as to correspond to each   of said plurality of receiving grooves (8).   2. Electric induction type cooking appliance   magnet according to claim 1, characterized in that said plurality of receiving grooves (8) are   arranged so that said grooves are provided   seated sequentially by forming concentric circles from a center of the lower base of said body (7) of the cooking appliance towards the outside of this body, said lower base center of said body (7) of   the cooking appliance constituting the center of each of the   said concentric circles, and said plurality of elements   of the induction heater (9) being fixed in a corresponding manner   laying in said plurality of receiving grooves (8).   3. Electric induction type cooking appliance   magnet according to claim 1, characterized in that each groove of said plurality of receiving grooves (8) is serrated over a predetermined width and is arranged parallel to the adjacent receiving grooves, and said plurality of induction heating elements (9 ) are set accordingly in   said plurality of receiving grooves (8).   4. Electric induction type cooking appliance   magnet according to claim 1, characterized in that said plurality of receiving grooves (8) are arranged in a sequential arrangement by forming concentric circles from a center of the base of the body (7) of the cooking appliance in the direction of the outside and are also divided radially at said center of the lower base of said body (7) of the cooking appliance and that said plurality of induction heating elements (9) are correspondingly fixed in   said plurality of receiving grooves (8).   5. Electric induction type cooking appliance   tromagnetic according to claim 1, characterized in that each groove of said plurality of grooves of   reception (8) has a rough surface.   6. Electric induction type cooking appliance   tromagnetic according to claim 1, characterized in that each groove of said plurality of grooves of   reception (8) has the shape of a V returned in the sur-   face of the lower base of said body (7) of the cooking appliance.   7. Electric induction type cooking appliance   Tromagnetic according to claim 1, characterized in that each of said plurality of induction heating elements (9) comprises a metallic material having a magnetic property and applied by injection, over a predetermined thickness, on an adhesive material (10) deposited in each groove of said plurality of receiving grooves (8), and of aluminum applied by injection   and covering, over a predetermined thickness, said material metallic line.